Question

Si disuelves 5 gr de K2CrO7 en 3/4 L de agua. Que concentración M. resulta?

Answer 1

Mm K2Cr2O7 = 294.18 g/mol

1. calcular moles

n = 5 g / 294.18 g/mol

n = 0.017 moles

2. calcula M = moles soluto /v(L)

M = 0.017 moles / 0.75 L

M = 0.0128 molar